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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8016e3508cd7b5ffbcbafbaed11ec564fea12c67c47e12eedd39906de9a394e9' 
  AND token = 'PP6YTciX6r6djQq7BJeUOJI5rmt3ii6IS/50fX1652M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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