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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2426988bc46b6e3064e6c31a446a94d037e065a8ee116d03cfe1277932b0ac62' 
  AND token = 'AWMS7NzxIlxE55vnBJwxCdqoqT21q93W6+MULixkjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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