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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85f766f5574efef54531a90978bd337ae536db533a069e7f2a59646d3ef1286' 
  AND token = 'KHpHXSvL1iHujNS07VYf4Jxx7ave/kOWj3TQcQE+W5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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