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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd68809b7ad30ea2b0c1aeacc3b85404ecfb268a047af15c24eb973a6fc8ef91' 
  AND token = 'BoDsFfGlu2YRgzbYBWbmYrxat9a1p2D9H2Y9sJMeH/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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