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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151afac6c449dcebe40e70e5db9816b0faaca7c6a7703bac9d36991080facc91' 
  AND token = 'az2aEQPacbP7ppFMzS9ra1HsHkmJA7zbURFcvJ6toFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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