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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05f0505a9fabffea955ab8ddc34b5d27e066310700d847a3721e92af387de77' 
  AND token = 'RY5Tn7H0rbukb4yC/94qyOWkW5SJDKzgeo4FYypq6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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