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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b982164652007f05b67dbb8cb949dbd21a5f8dad2de2f01b7a4dc6ac9a45988' 
  AND token = 'ns9RTB2Ze3VorEAW9qnbtbXLefH1bl9We1jMcG7iY8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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