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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cd9c11696ee8612c5958e024f1c60a5ce9c8a5c20978388582787ab57d652d' 
  AND token = 't8bz9VMbHOpd0qRAG88z/faJuSw3ZZD8ulv1iez3cm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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