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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513fa9b6ac947ec4f998d808761575d4f65d7ad92a5d9e316c947c57dc401eb1' 
  AND token = '8F+nZ8I19OU+4EZdqa6n0vJ4GRz+UAmFRxtI3rOhF3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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