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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195957bad03345b7114895b393b232fd4f15ce070f2ae05e804a403fc8f5d735' 
  AND token = 'edgp6hNDXmfN74GoA7MdIaKSLUmBi7Z2tlyyoT0aJEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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