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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2751b4b0a2c0c064943cbc9d3215b7144a21a3e7ebc37b531f43ca6d1acc90e' 
  AND token = 'Sc8wAUpv1odxMsizPGjCavuJhZUW4Sxb2lBetCd3Wns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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