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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87da32a56438f777aa48e6a9ad3ea5f165987bf7c1bbe206d4c151e0a195cd7d' 
  AND token = 'zPNEVnutGqGMsJdBS8+3b3DkCMA7c0bfJH23hjebIOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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