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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0cc10de9f2c49c70b153274c4c7bf32a049c21a3c8edd2624363198ef228d3' 
  AND token = 'LSHM0i7dotheOkz/K/HLvFLXTMhpM0E18Q+g0GmC/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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