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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bec96dbf81b997a9f61eabe726cd4f60579bd6ab1594024a04756bf3765b3d' 
  AND token = '1b9ln+VaecvGdQk9vZsG2P7iCplNCun78QCTgmXQhOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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