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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357e227af6688e5b85171c0c037965aba37c1dda9f28ae5241a40a5cba03b3bd' 
  AND token = 'fllgJ+8E49uCozHPGzc5bJg4R0ZpKx0QPTeaFDgwXhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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