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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c1e42391e7269ceec1a71161e88ec89358204fceec5eb951ab4420cbe1067d' 
  AND token = 'I2uqq9PmAOlXdMscVBf0An//31o4PwyvVlGW1JZzi48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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