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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea8071bb45dd9e6cfef5be1baffbc738536192ad7a945a835d95ae6316b26f8' 
  AND token = 'ywmFjaXVnFyDcdG58FyQOhcw/kDgUbhjctwru2/9FQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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