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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7b1a9fc5c0a8ab70f1b6b59e9d2e6a8a0821d6bfecba453ec8fe539f142c58' 
  AND token = 'UC5JJS0abxPPo/9sF4jTErVT1qFM373udkra1OOyRyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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