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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002792d40233fec4b37a5e1cd8b1480cab5dc65610547025bcdd0ad805ba725e' 
  AND token = '8ZJvCYgHctQLHH3JzFY0U3wyR4cx/cKZItqsA9yLadc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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