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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a605befea7773d3022647a5b2126a330dae46f073ab06128a93a8f7bc719b1' 
  AND token = 'TnICPg4QohVRiIYdCqd5eGlG1hlzZ931gz9BgC7AIB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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