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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429ba6e2ff3ec23276335c691ecec26ff15322b16f9437079067388e5975628f' 
  AND token = 'oe1SX3o3y/OJu2qNpPnuC+8RpvfGqjg/jnyplbfVAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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