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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd978b78a547c26087ba391fbc9a0aa92c65abc6d64523a07b7ec11ded52aefc6' 
  AND token = 'lc1W7R3A+vwk1gdtbmicIMA0KJwa0PIPwbJ96SuAFwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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