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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65758547bb94c33a8675b4bbe19639ce7ab17486726c8e0aac8262c5bda5cbe8' 
  AND token = 'bCOJLAvHywWVoP6o+mxu+jay4bmk/Gu6M/MoTTgftH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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