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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8079b55bfcb292e659b84b317da075e6f0cbf14097ef626038502cd6e4ae1d9' 
  AND token = 'ltmbrYee6OyoC1uqG0ndSueDWmELiSEWpd8mHo4YACc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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