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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a2f8f53814b88ad28964db42b80f33bb37fc865a9cabd372cdcc9cca947791' 
  AND token = 'vjScSYmVjQy+8cSZGaKtqaJIMrWEZEVHbcTrkf35Rdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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