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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c417e107301384fb75df58dc8b373f35193811cede309a4cd1f8818cbcac7858' 
  AND token = 'dTce3Wh7rVkYZzvruk/BLKsmgRR2t69W30j968xgC34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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