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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0aa68f5f3a3b6b7cea1fa75e7f169e56a39d697d2275a09c16a7083b78e820' 
  AND token = 'UgMpPhPg+vX28yc8ofpXnVBGfzH9L2kACzt6CMtpF0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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