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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e575a3879ffdb15cff6e6a117bcfd79d240fe3b79a92947a49ffe8208ec8eb' 
  AND token = 'NS5ceskyRgXclxzdXRqS5icCj8fffToHZfwxekRCEZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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