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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d74e0eab8c51d7967390b87670a17add0e9b2c4284dada2078e7a39a9e5c35e' 
  AND token = 'cu3wHhTM+Ar39+KNOw0neQAePEiSXEIn0l7kM/NSdzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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