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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7d32cf8c4d4d1cc4f4a34a816b717db057ee1ee5eb186648cd178cbe4bbf8a' 
  AND token = 'c1U/8MLsPxWKT5uqyJYPFx4G/V02l+uY4UhozZodj7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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