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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df967c529bcde2b0da2be8d660c4f0a01d70067c3597c1a7afc146247942101b' 
  AND token = 'ViJ/Seu5mbMC853MwSSSANHlXSb1RFr7RnEGqHd073g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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