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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997d06d047b55b42cecd15c667b99c1e0367d743d33680aee514e5bde7aa67e5' 
  AND token = 'N36mzc3X63jZwxDaVBasz31HvsZeg7jOhSbfCL2n3QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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