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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb348de6be3fcec678855252ba5832ec8f18359c6cca52da22cb19ef463220e' 
  AND token = 'P0IRgP2YI1hSvInLH3WhrIu95jzZciFW1wl/YMqr6HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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