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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9298a94c06e2c0815b802d3eb8a78d2e01206797d709642c316840519280e3ad' 
  AND token = '8dS6TcaU8DOOU+GEajBOJb7AhIocDnqBVy9xfgXZD+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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