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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d19fc279cc9c960a9da0f1eb2c7d811036d420fe8947b89ba1bcd358807502' 
  AND token = 'o/ZnE6WjzbEsefZa6Dffcb/PWJgK61s+B5JN4fdv/9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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