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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f80b41e89016d5ddf0dfb0f30a4c9e7240977d62ae8b17205e8114f805110e9' 
  AND token = 'TCLOUSiuNZm2c+frxGTAHKCewi54gCy2M2AO7vjT38c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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