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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78e90694740bd12720616e1b715b88b60e50e2a923580f2ae479648e31d4ce3' 
  AND token = 'ppsBCkleVAx2EYV5rylyGkY406Ii4fA1Ae61zffYpqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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