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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6608646357803c073e9a4ab619f404238b75ffd16fd75eb4662724b103f2d045' 
  AND token = 'pini04YrDzRHt/tFMaudFI+ygiNFAZQqooVHSkzWsK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}