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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e12c791151011bcd2e866984a9c3c3e2552778c40620217f0a83649f13ecf7' 
  AND token = 'xxOR9TaOCTh/SaIMgPD2TQHLEcRFAGXe01v1I0+Tzro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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