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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898b7b02b720964fef141a0f95ad0802778ed4893b367aa41a2983ac615a3897' 
  AND token = '0V/GMogA8YrSDSN9g2JJc7kqvJnpvczJQS0ICyL6lgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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