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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507fbf77dab6c5f24017f4d4b2bcf576ef6326a9660ac7c58e41263c0a48bbc7' 
  AND token = 'c8r0iFMADJsIaPj849ktQ7wTf7n1wj3+kh6Xk4y4URU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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