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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c4c7e8d4c3405097910da59b4e3f13c37bf823680c5c45e664847f2fab36d8' 
  AND token = '7lvQO+1mfy3co0/tw6K1K44bR/DkVA1ilNfEjfT7+UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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