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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3e49381c31827b9d4fd095455e5ae3003a0278059d87b45ea95fe296923111' 
  AND token = 'D1OfTwfVpwMaU6mnCE1yO5K38WxxH1fq8XNUtOIKU5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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