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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb7736cc5846c9b889ffe6b213cfd196e50291a2af8d99a0d1e196ce23578dc' 
  AND token = 'OA8PuSP9HJwD7B3OT6jCTUmb9kqvvO5eALzJKkqzd3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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