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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f039eada0777aa508ae9c741ac4e5faf84252f25796e7ebdf47a183c293aeac1' 
  AND token = 'ez00Y1A+q89/itwNfeK2Pj/UHqGR85DpF06JN9bxP8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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