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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f09301db5479bd172c697303e8f78f70920bb4796f928529d04b66b0fc718' 
  AND token = 'qy1tdGMIVw9NeHfhNAP1TKQKOQxKCpn4XD61jS7dCCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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