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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7aeb0f0995204ea1e44ed52eb75c3140a11cec683ec13d0ee5c7443b448816' 
  AND token = 'Z2JNGVntp8/XjVZhGfhCRJoY1GT3TlZN0sq55W95qJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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