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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd0607034721fd4a81f5da1b55a264cb56841e5b13a88c4d844a281a1410b75' 
  AND token = '8dxDhJsZiI1wW4U1xVresmn5B8SzUwA6KsPEluaC9To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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