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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f5c7106412439ba839f70969e0d0618fae9f4a76f7b477269f64fbf5d1f8ee' 
  AND token = 'lrKMkMT6F/yIAoaRzPG4+DXY9CPa7sa40sYxB0g89QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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