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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bc0222aa7d5b2854d8d9fc5d4b9da47c8dd08b1ccf99ad6e2dda6ae081b4f6' 
  AND token = 'hvnUoibszGqSlnikHjJIjMUD13cO6dpC1EgzPe+/3V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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