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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89730765f45f10fc840a98395e8369f29ffa65007f736c225ac71be48666bc0' 
  AND token = 'o9t68TCyrdT+SAEk1yjqg7vmSlfHRosMiqdyhMG47wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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