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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657ba5da139424ccd156c6e19ddef0a1e6817bff8f9a32c7831d1e49dfc4a91d' 
  AND token = 'GBc82vZE/Jdlu6e6wx8ivMig7jV7BNJvO03M7n52Zh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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