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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeea8f6015ed73d29f90fefc4ba6a278289e307c5a8969c7bf85374fc4856d3' 
  AND token = 'yJWvi04sH3lW4K3Le/WI7i9RBKnMCF2SsGWWgWCuIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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