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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36636072cf7e4bb61e4a4d6ad7f6f230c4a8cbb56231d039e50b18e47db26149' 
  AND token = '3msbVda0b9PCB079oK+r6kQb9cIivVRHItknnE65B/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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