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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a97ebe34acfcf35608e6f4304e8443a34528e22010708d130c10c2502544e30' 
  AND token = 't53/s+Xf3JeMudDfncAWhmfuhN5/hCduum6OTvPzEb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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