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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edffb29619bf1ec99db64a27b6424f15805cc4447e6556d85972ca5b12dea8a0' 
  AND token = 'FDea4CJz/LeW5zgR518ua8v9cdI+ha2OVQginFAiwdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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