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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd9d5481454489d457980bef1518772239a73e6db75fefa0b4210e635506346' 
  AND token = 'pLURpTeLWL+tzDuoCyWNU7NKgdx3Tm5Bs1HRd1Y8B6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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