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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1669a36b03c040dc1051802d1cdbf54f41eaaa8cbefe1e158f100df1e78c0efe' 
  AND token = '5SmKJtxRGEUudK28N9G5fGv/DRBZtBQJY54k79iGcGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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