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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bea0e467bcd59524c8c06e118e429cd7806009a828d17d0feddaa8af51c98ff' 
  AND token = 'PeCeTQkM79aBsOc5+eOPxZ8DdVF4JGfMrOtbA12b7Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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