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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c647b1bb0bb76615daf3bd42b2c2a6d92bc6fb81b1ac7000050725cf1720df' 
  AND token = 'ljvR8jHaA0vb8xE6CNu2xM5zdsQgjh2UJQyCTlfc+IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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